diff --git a/libs/ardour/smf_source.cc b/libs/ardour/smf_source.cc
index 8f997060ca..b33fb16f48 100644
--- a/libs/ardour/smf_source.cc
+++ b/libs/ardour/smf_source.cc
@@ -234,7 +234,7 @@ SMFSource::write_unlocked (MidiRingBuffer<framepos_t>& source, framepos_t positi
 
 	Evoral::MIDIEvent<framepos_t> ev;
 
-	cerr << "SMFSource::write unlocked, begins writing from src buffer with _last_write_end = " << _last_write_end << " dur = " << duration << endl;
+	// cerr << "SMFSource::write unlocked, begins writing from src buffer with _last_write_end = " << _last_write_end << " dur = " << duration << endl;
 
 	while (true) {
 		bool ret;